CVE-1999-0347
CVE-1999-0347 is a critical-severity vulnerability with a CVSS 2.0 base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.
Key facts
- Severity: Critical (CVSS 2.0 base score 10.0)
- EPSS exploit prediction: 7% (94th percentile)
- Actively exploited: Not listed in CISA KEV
- Published:
- Last modified:
Description
Internet Explorer 4.01 allows remote attackers to read local files and spoof web pages via a "%01" character in an "about:" Javascript URL, which causes Internet Explorer to use the domain specified after the character.
Frequently asked questions
- What is CVE-1999-0347?
- Internet Explorer 4.01 allows remote attackers to read local files and spoof web pages via a "%01" character in an "about:" Javascript URL, which causes Internet Explorer to use the domain specified after the character.
- How severe is CVE-1999-0347?
- CVE-1999-0347 has a CVSS 2.0 base score of 10.0, rated critical severity.
- Is CVE-1999-0347 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-1999-0347?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-1999-0347 published?
- CVE-1999-0347 was published on 1999-01-26 and last updated on 2026-06-16.